Diane Henders Books in Order
Browse Diane Henders books in order, with quick summaries, Never Say Spy and Inappropriate series guides, and easy advice on where to start.
Last updated: June 7, 2026
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Publication Order
21 books
Never Say Spy
by Diane Henders
2011
Bookkeeper Aydan Kelly is ready to leave the city for a quieter life when a carjacking drops her into a techno-espionage mess. Suddenly suspected by the law and hunted by spies, she has to fight for her future.
Reach for the Spy
by Diane Henders
2011
Aydan's seemingly safe work with secure computer networks turns deadly when a trusted coworker is shot during an apparent act of treason. To clear his name, she starts asking questions that point much too high.
Tell Me No Spies
by Diane Henders
2011
Aydan has accepted her dangerous side job, until she learns the government murdered her husband. Betrayed and on the run, she must dig out the truth while dodging agents and criminals eager to sell her out.
The Spy Is Cast
by Diane Henders
2011
Aydan agrees to go undercover at a glamorous gala and quickly learns spy work is less champagne and more terror. Once criminals discover she has breached their operation, staying hidden becomes a life-or-death problem.
How Spy I Am
by Diane Henders
2012
Aydan uncovers scientists selling classified information, but exposing them could get her supposedly dead husband killed. Every move risks betrayal, and staying silent may be just as deadly.
Probably Inappropriate
by Diane Henders
2012
The first Inappropriate book collects Diane Henders's blog posts into a brisk volume of comic essays. Expect middle-age mayhem, domestic mishaps, and the kind of observations that probably sounded funnier in her head, but only by a little.
A Spy for a Spy
by Diane Henders
2013
To protect her lover's career, Aydan lies about being an experienced operative, and the lie lands her on a mission she cannot control. Cut off from help, she becomes a pawn in one obsessed spy's revenge.
Definitely Inappropriate
by Diane Henders
2013
The second Inappropriate collection brings together more blog posts from Diane Henders, blending rude jokes, sharp self-mockery, and everyday Canadian chaos. It is light, loose, and best read with a sense of humor.
Spy, Spy Away
by Diane Henders
2013
Everyone now believes Aydan is a seasoned agent, which is bad news because she absolutely is not. Forced undercover with a sleazy cover identity, she has to infiltrate a criminal group and steal a secret prototype.
Spy Now, Pay Later
by Diane Henders
2014
Aydan wants her old life back, but missing coworkers and a stolen weapon drag her into another investigation. When her lover is abducted, she learns exactly how dangerous an angry bookkeeper can be.
Spy Away Home
by Diane Henders
2015
A gunman kicks in Aydan's front door, and the attack looks tied to someone inside her own world. Using herself as bait, she hunts for the breach before another assassin reaches the people she cares about.
Spy High
by Diane Henders
2015
While guarding her boss's hippy parents on an isolated raincoast commune, Aydan hopes for a quiet assignment. Instead she uncovers a murder plot and a secret that puts the whole commune in danger.
Totally Inappropriate
by Diane Henders
2015
The third Inappropriate volume serves up another helping of Diane Henders's blog writing, full of irreverent takes on middle age, home life, and everyday embarrassment. It is a quick, funny read with a slightly wicked grin.
Completely Inappropriate
by Diane Henders
2016
The fourth Inappropriate collection rounds up more of Diane Henders's blog pieces on daily life, aging, marriage, and whatever absurdity crossed her path. It is candid, silly, and happy to laugh at the awkward bits.
The Spies That Bind
by Diane Henders
2016
Ordered to go undercover as an arms dealer, Aydan instead chases a lead on a missing child taken by a serial killer. Now she has to juggle a killer, a gunrunner, and the safety of the people she loves.
Unabashedly Inappropriate
by Diane Henders
2016
This fifth collection gathers more blog essays from Diane Henders, mixing middle-age misadventures with sharp observations and offbeat humor. Dip in anywhere for quick, funny pieces about life refusing to behave.
Kiss And Say Good Spy
by Diane Henders
2017
Posing as an arms dealer, Aydan stumbles into a plot to attack Remembrance Day services. She has to stop the terrorists while working beside an unstable partner and deciding how much she is willing to risk to save her lover.
Once Burned, Twice Spy
by Diane Henders
2018
A routine protection job turns into a nightmare when Aydan is blamed for an attack on weapons developers and the theft of a classified device. Hunted by allies and foreign agencies alike, she cannot even trust her own memory.
Friends In Spy Places
by Diane Henders
2019
Aydan's supposedly dead mother resurfaces after thirty years, and the Department thinks Nora may be a traitor. With prison looming and her friends under threat, Aydan has to uncover the truth before time runs out.
A Spy For Help
by Diane Henders
2020
Off duty at last, Aydan gets pulled into a dangerous rescue when Arnie's long-lost sister is targeted by a crime lord from her past. Love, loyalty, and the law collide as Arnie edges toward murder.
Spy In The Sky
by Diane Henders
2021
Aydan Kelly investigates a disgraced CIA agent's death and uncovers a trail leading toward an arms dealer and possible corruption at the top. Then twenty million dollars lands in her account, and she has only days to clear her name.
Where should I start?
If you want the whole spy story from the start: Never Say Spy → The Spy Is Cast → Reach for the Spy
If you want the series once Aydan is fully in the game: Tell Me No Spies → How Spy I Am → A Spy for a Spy
If you want later missions with bigger stakes: Spy High → Spy Away Home → The Spies That Bind
If you want Diane Henders at her funniest: Probably Inappropriate → Definitely Inappropriate → Totally Inappropriate
Author bio
Diane Henders came to fiction after a long working life, not straight out of school or through some neat publishing plan. Before she started writing novels, she worked as a technical writer, spent years as a computer geek, and, by her own amused telling, tried interior design long enough to learn it was not her gift. That mix matters. Her books feel written by someone who knows how ordinary jobs work, and how fast ordinary life can turn ridiculous.
She also grew up far from polished city life. In posts about her childhood, she has described growing up out in the sticks on a Canadian farm, with cattle, cold weather, and even an outhouse instead of indoor plumbing. You can feel that background in her writing. She likes capable people, practical details, and humor that does not mind getting a little dirt on its boots.
Then midlife hit, and she took a sharp left turn.
Henders has said she took up muay thai during her mid-life crisis and started writing thrillers with a middle-aged female lead. That was a conscious choice. She was tired of seeing women over forty treated as if their exciting years were behind them, and she went looking for stories about tough, confident women in that age range. When she did not find enough of the books she wanted, she wrote them herself.
The result was Never Say Spy, which introduces Aydan Kelly, a middle-aged bookkeeper who gets dragged into espionage whether she likes it or not. It was a strong beginning for a reason. Henders mixes spy-thriller pressure with Canadian settings, blunt humor, and a heroine who solves problems with brains, nerve, and a very healthy supply of profanity. The book found a wide audience, and Henders has noted that it spent years on Kindle's Women Sleuths Top 100 list and logged hundreds of thousands of downloads.
She did not set out to build a huge series, either. By her own account, every time she thinks she is finishing Aydan's story, another book starts banging at the door. That helps explain the momentum of later entries like The Spy Is Cast, Spy High, and A Spy For Help. The stakes keep rising, but the heart of the books stays the same: loyalty, betrayal, secret agencies, oddball side characters, and a woman in midlife who refuses to be underestimated.
She has a nonfiction side, too. The Inappropriate books, beginning with Probably Inappropriate, collect posts from her blog about the hazards and absurdities of everyday life. They show the same voice that turns up in the thrillers, dry, candid, a little mischievous, and very aware that bodies, houses, weather, and social situations are always waiting to embarrass us.
She does not sand the edges off.
Henders has been upfront that strong language is part of the package, because it fits the people she writes. That plainspoken attitude carries into her life off the page. She lives with her husband in rural British Columbia, where fruit trees, gardens, and bear country provide plenty of real-world excitement. She has also written about target shooting, auto mechanics, painting, music, food, and martial arts, which gives you a pretty good sense of the world behind the books.
Put it all together and her appeal becomes easy to see. Diane Henders writes for readers who like action, jokes under pressure, messy loyalty, and women old enough to know better and bold enough to do it anyway.
Edited by
Software engineer whose passion for tracking book recommendations from podcasts inspired the creation of MRB.
Lead investor at 3one4 Capital whose startup expertise and love for books helped shaped MRB and its growth.
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